Single cell series charging lead

This is an idea for a simple battery charging lead that HobbyKing might like have produced. I have not seen this product anywhere yet, but I have made my own and myself and friends find it very useful indeed.

Single cell LiPo batteries as used in micro aircraft, have the following issues:
• battery testers cannot be used to gives a readout of battery state, since they need two cells or more to do so
• charging one battery at a time takes many hours after a flying session when several batteries are have been used.

Leads can be bought to combine batteries in parallel, but:
• battery testers still cannot be used, since batteries in parallel appear as a single cell
• charging several batteries at once is possible, but risky, because if one cell is bad, it still gets charged at the same rate as the other cells and could explode.
A series lead would give the following advantages:
• battery testers can give a readout, provided more than one cell is plugged in to the lead
• balanced charging can be used, giving safe charging to the full capacity of each battery.

I use a home-made series lead for three cells, and if for example I want to charge two cells, I just plug in a third cell to make up the numbers. The balancing charger seems happy enough to charge the two and keep the third at 4.2V.
The series lead can accept any number of batteries for testing. However, balanced charging requires exactly the right number of cells to be plugged in. Leads could be made up and sold separately or in sets for 2, 3, 4, 5 and/or 6 cells to be charged at once.

Users would have to be told clearly that the charge rate must be set based on a single cell. Otherwise a user who connects six batteries, and multiplies the charge rate by six, will be charging at 6C. For example, if charging a 160mAh with a couple of 300mAh cells, the charge rate must be based on the 160mAh. The charge rate is then 0.16Amps for 1C, 0.32 Amps for 2C, so the user would probably select 0.2Amps.

The wiring of a series lead fairly obviously makes several single cells look like a multicell battery, and I can provide a diagram and a photo if it helps.

If the idea can be used, then please go ahead with my blessing.